Spoerri Inc. is proud to introduce its AGROWINN line of Fertilizers and Soil Amendments. Rock Dust, aka Rock Powder & Stonemeal (Stone meal), Earthworm Castings aka Earth Worm cast or castings. The web site is relevant to fertilizer, organic, fresh, active ingredients, humus, nitrogen, environmentally safe, well balanced soil, rock dust, Rock, Dust, trace elements, trace minerals, calcium, ...